Answer:
In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom. Most commonly, in the core of a star, two hydrogen atoms fuse to become a helium atom. Although nuclear fusion reactions require a lot of energy to get started, once they are going they produce enormous amounts of energy.
Explanation:
Need help answering these questions. Please show all work. Thank you so much.
Answer:
i dont know
Explanation:
Will give brainliest
Answer:
12.5
1.95x10^-10
1.5
0.5
in that order
Explanation:
what is condensation transfer of energy?
Answer:
Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.
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Write the position of metals, non - metals and metalloids in the periodic table.
Answer:
The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.
Can someone please help me with this question.
Answer:
Birds evolved from a group of meat-eating dinosaurs called theropods. That's the same group that Tyrannosaurus rex belonged to, although birds evolved from small theropods, not huge ones like T. rex.
Answer:
we haven't done anything to study the roots of the bird yet
Which of the following statements about atoms is true?
A) atoms can be seen with the human eye
B)atoms can be divided or destroyed in chemical reactions or through physical changes
C) in a chemical reaction, new atoms can appear that weren’t there to start with
D)atoms make up substances
Answer:
D
Explanation:
Atoms make up all matter on earth, basically atoms make up everything, even air.
A 200 g block of a substance requires 520 J of heat to raise its temperature from 25°C to 45°C.
Use the table to identify the substance.
The answer is gold.
Explanation:Substance: Specific Heat (C) in joules per gram/degrees centigrade:
Water (ice) 2.05
Iron 0.46
Aluminium 0.90
Gold 0.13
Copper 0.39
Ammonia (liquid) 4.70
Ethanol 2.44
Gasoline 2.22
Water (liquid) 4.18
Water (vapor) 2.08
Air (25 degrees Celsius) 1.01
Oxygen 0.92
Hydrogen 14.30
To know that we clear the equation q=m*C*Δt for the specific heat (C) and solve the equation. Keep in mind that we need to use the heat (520 J) in Joules since the values from the question and the table are in Joules.
q/m∗ΔT = C = 520J/200g∗(45degC−25degC) =
0.13J/gdegC
As you can see, the substance that has this specific heat is GOLD.
The value of specific heat for the given data in the question will be for gold:-
[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]
What will be the Specific heat of the material?Specific heat can be defined as the amount of heat one kg or gram substance can absorb or release for a unit temperature difference.
The formula for the heat will be:-
[tex]Q=mc\Delta T[/tex]
m= Mass of substance
c= specific heat of the substance
[tex]\Delta T[/tex]= Temperature difference
Now the given data is
m= 200 g
Q= 520 J
[tex]\Delta T[/tex]= (45-25)=20
[tex]Q=mc\Delta T[/tex]
[tex]520=200\times C\times 20[/tex]
[tex]C= \dfrac{520}{200\times 20} =\dfrac{520}{4000} =0.13\ \dfrac{J}{g ^oC}[/tex]
Since the value of specific gold is [tex]0.13\ \dfrac{J}{g ^oC}[/tex]
Thus the value of specific heat for the given data in the question will be for gold:-
[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]
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Which of these does not describe the Wright brothers' first attempts at flight?
A. They created their own wind tunnel.
B. They mimicked the flight of birds.
C. They used fixed wings on the model.
D. They had engines that propelled the airplane forward.
They mimicked the flight of birds.
Answer:
B.
Explanation:
Just took the test
15) When dilute sulfuric acid is added to zinc metal the products of the reaction are
A zinc oxide + water + hydrogen
B zinc oxide + hydrogen
C zinc sulfate + water + hydrogen
D zinc sulfate + hydrogen
What is crystallization how can you obtain bigger crystals
Answer:
Crystals that grow more slowly, tend to be larger. For crystals that were grown by slow cooling of the solvent: it usually improves the quality and size of the crystals, if the solution is slowly warmed up until alomst all crystals are dissolved again and than cooled dwon a second time very slowly.
Explanation:
rystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.
Which of the following is the ground state electrons configuration of the F ion
Answer:
That leaves us with: 1s2 2s2 2p6 And that is the electron configuration for F- , the Fluoride ion.
Explanation:
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How much KNO3 can be dissolved at 50 C in 100g of water?
Answer:
Initially there is 100 g of potassium nitrate in solution, at 50 °C the solubility is 84 g/100g (original data or graph), so 16 g will have crystallised out
Explanation:
Which part of modern atomic theory was first developed by John Dalton?
A. Atoms cannot be divided.
B. Electrons are spread throughout an atom.
O C. Atoms are rearranged during chemical reactions.
O D. Electrons are found in a cloud around the nucleus.
Answer:
C. Atoms are arranged during chemical reactions
Explanation:
All matter is made of atoms and atoms are indivisible and indestructible. compounds are formed by a combination of two or more different kinds of atoms.
Which of the following diagrams represents a single
replacement reaction?
Explanation:
i think the answer is....b
The diagram that represents single replacement reaction is:
b.
Single replacement reaction:This reaction is also known as displacement reaction. It is a reaction in which one element is substituted for another element in a compound. When a replacement reaction occurs, a new aqueous compound and a different pure element will be generated as products. For example:
[tex]2HCl(aq)+Zn(s)--->ZnCl_2(aq)+H_2(g)[/tex]
Thus, option b is correct.
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What is the empirical formula of a compound that contains 28% iron, 24% sulfur, and 48% oxygen by mass?
Answer:
Fe2S3O12 would be the closest Answer
Explanation:
Mitosis creates
that are
in chromosome number.
A) Somatic Cells ; Haploid
B) Somatic Cells: Diploid
C) Gametes: Haploid
D) Gametes ; Diploid
Without the atmosphere, life on Earth would not be possible. Which of the following is NOT an explanation for how Earth’s atmosphere protects life on the planet?
A. It allows visible light to pass through completely.
B. It contains gases that filter out ultraviolet radiation.
C. It keeps Earth warm by trapping in heat.
D. It protects life from ultraviolet rays of light
Answer:
B
Explanation:
IM A CHEMISTRY WIZZZZ
:)
I hope u get full marks on your paper/test/quiz or whatever!
There is a 20 percent chance so stay positive!
Answer:
D
Explanation: ultraviolet rays are harmful to humans
If you place a piece of iron at 90 °C into water that is 25 °C, in which direction heat will flow?
Answer:
Determine the final temperature when a 25.0 g piece of iron at 85.0 °C is placed into 75.0 grams of water at 20.0 °C.
First some discussion, then the solution. Forgive me if the points seem obvious:
a) The colder water will warm up (heat energy "flows" in to it). The warmer metal will cool down (heat energy "flows" out of it).
b) The whole mixture will wind up at the SAME temperature. This is very, very important.
c) The energy which "flowed" out (of the warmer water) equals the energy which "flowed" in (to the colder water)
Explanation:
Describe how different environments support different
varieties of organisms
Answer:
How is an environment able to support different varieties of organisms? ... It provides all the necessary conditions, such as temperature, space, water and food resources, oxygen and carbon dioxide, that suit the needs of the organisms. Examples of habitat include forests, mountains, bodies of water, and even puddles.
Explanation:
Select the correct answer from each drop-down menu.
An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be_____. If the atom gains 4 electrons, the net charge will be_____.
Answer:
Answer: If the atom loses 2 electrons, the net charge on the atom will be 2+
If the atom gains 4 electrons, the net charge on the atom will be 4-
Explanation:
An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.
Protons are positively charged, neutrons are neutral and both are located in nucleus where mass of an atom is concentrated.
Electrons are negatively charged and are located outside the nucleus where they orbit in different energy levels around the nucleus.
In an atom, when electrons are lost, the atom gains a positive charge and forms cation. In an atom, when electrons are gained, the atom occupies a negative charge and forms anion.
Thus an atom with 9 electrons and 9 protons will be electrically neutral.
On losing 2 electrons, there will be 7 electrons and 9 protons will have 2+ charge.On gaining 4 electrons, there will be 13 electrons and 9 protons will have 4- charge.
What percentage of animals are invertebrates?
1. 50%
2. 25%
3. 95%
4. 5%
Answer:
3. 95%
Explanation:
Invertebrates make up over 95 percent of the Earth's animal species. For many years, invertebrates have been kept as pets, displayed in aquariums and zoos, used for research, and consumed.
Answer:
95% i took the test
Explanation:
please help >>>>>>>>>>>
Answer:
Explanation:
mass of 1mole of brick = mass of 1 brick x avagadro number
= 4 kg x 6.022 x 10^23 bricks = 2.4 x 10^24 kg
No. of moles of bricks have a mass equal to the mass of the earth
= mass of earth / mass of 1 mole of brick
= [ 6 x 10^27 ] / [ 2.4 x 10^24 ]
= 2.5 x 10^3
= 2500 moles
Is Oxygen more reactive than Beryllium
At what temperature does water freeze?
Answer:
32 degrees
Explanation:
5. Name three different waves you use on a daily basis, Explain how you use them
Answer:
We use radio waves for communicating or a for television and radio. We use Heat waves to heat things. We uses heat waves everyday for heat up food in the microwave and drying clothing when using the dryer or when drying our hair with a hairdryer. Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.
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Discuss FOUR ways in which one's acceptance of responsibility can influence
effective communication
4x2
Answer:
being responsible is owing up to the possible
consequences of your decision whether it was right or wrong.
communication is a two way process in which there is a messenger and receiver
one of the ways by which a person could be responsible is by saying 'I'
in all the things he would say, instead of 'we'
for example , " We don't like the way you acted a while ago " , change it to i don't like tye way you acted a while ago.
here u r establishing ownership on the things you want to say to the person
Acceptance of Responsibility creates more rapport, increases teamwork, increases honesty, and makes each party look at things from a position of rationality and mutual understanding.
What is Acceptance of Responsibility?When a person accepts responsibility for their actions and or tasks or their work or their organization, it means that they have elected to become more accountable, looking at things from what they can do to help achieve the collective goal rather than their personal aspirations.
This reduces conflict as most conflicts are borne out of self-interests.
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For the reaction HNO3 + Mg(OH)2→ Mg(NO3)2 + H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3? Balance the equation
Answer:
2HNO3 + Mg(OH)2 --> 2H2O + Mg(NO3)2
593.2 grams Mg(NO3)2
Explanation:
First, balance the equation
The first thing I notice is that there are 2 nitrates on the reactant side so I would put a 2 in front of HNO3. Now the problem is that there are 4 hydrogens on the reactants side, so add a 2 to H2O.
Next is stoichiometry
We are looking for Mg(NO3)2 so use the balanced equation to create a mole ratio and then convert to grams.
8 mol HNO3 * 1 mol Mg(NO3)2/2 mol HNO3 * 148.3 g Mg(NO3)2/1 mol Mg(NO3)2 = 593.2 grams Mg(NO3)2
593.2 grams of Magnesium Nitrate [[tex]Mg(NO_3)_2[/tex]] are produced.
Balancing the equation we get:
[tex]2HNO_3 + Mg(OH)_2 = 2H_2O + Mg(NO_3)_2[/tex]
Here we can see that [tex]2HNO_3[/tex] produces [tex]1Mg(NO_3)_2[/tex]
It implies that to make 1 mole of [tex]Mg(NO_3)_2[/tex] we need 2 moles of [tex]2HNO_3[/tex]
Therefore in 8 moles of [tex]2HNO_3[/tex] , 4 moles of [tex]Mg(NO_3)_2[/tex]will be produces.
Now, 1 mole of [tex]Mg(NO_3)_2[/tex] = 148.3 g
4 moles of [tex]Mg(NO_3)_2[/tex] = 4 × 148.3 g = 593.2 g of magnesium nitrate will be produced.
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Hello! Can you please help me do this question? I have to pick two but I’m not really sure what to pick..
Answer:
B and D
Explanation:
it is B and D because in no gravity if you change the size of the ball it does not change anything. and if you swing fast it does not change anything but the speed. if you change the angle it is just the same modle but different angle
Answer:
D, and E
Explanation:
they may not be correct but the answers seem correct. please tell me If I'm wrong.
What is the different things that we have and animals?
Answer:
the different things that we have and animals are.:
to gain emotional support.it acts as a real friend.for meat,flesh,milk and milk products, wool,etc.for transportation like horseto enjoy and play like with dolphins